Aluminum bulk-plasmon dispersion and its anisotropy

Linear response approach to collective electronic excitations of solids and surfaces

“…The reversed triangles and triangles represent the previous TDLDA calculations given by Quong and Eguiluz [18] and Lee and Chang [60], respectively. The experimental data are denoted by × [61] and + [62]. 3 .03 [62] Eq.…”

“…The experimental data are denoted by × [61] and + [62]. 3 .03 [62] Eq. (8) is solved in momentum space, which assumes periodicity in the z direction.…”

Theoretical study of quasiparticle inelastic lifetimes as applied to aluminum

“…The choice of such a material is motivated by the fact that aluminum possesses the free-electron-like band structure, and therefore many properties of this simple metal can be described well within the jellium model. In support of the latter, one can mention, e.g., the Fermi energy as determined by x-ray photoemission, 9 the plasmon dispersion and its very small anisotropy, 10,11 and the stopping power for protons and antiprotons. 12 As a consequence, aluminum can be considered as a prototype material that allows one to test a theoretical approach to quasiparticle dynamics of jellium.…”

Electron-density dependence of double-plasmon excitations in simple metals

“…4 One of the canonical applications of the studies of the correlation effects in a many-electron system is the dynamics of valence electrons in a nearly free-electron gas. The corresponding fundamental excitation experimentally observed in a simple metal at a small momentum transfer is the plasmon, [5][6][7][8] which is a collective excitation of the valence electrons caused by the long range Coulomb interaction and qualitatively understood within the RPA of the FEG.…”

“…In both cases, the scattering cross section is proportional to the dynamic structure factor S͑q , ͒, where q is the momentum and is the energy transferred to the electron system under study. In many experiments, the attention has been focused on the plasmon dispersion 5,6,11 but, especially in systems not resembling the FEG, the fine structure of the S͑q , ͒ gives important information on many-body and band-structure-related effects. [12][13][14][15][16][17] However, even when applied to the FEG, the RPA cannot explain, for example, the finite linewidth, which is found to increase with the increasing q = ͉q͉ ͑Refs.…”